Photographic roll film spool



Jime 30, 1931. I P. OLDACK ER ,8 3

PHOTOGRAPHIC ROLL FILM SPOOL Filed Nov. so. 1928 Patented June 30, 1931 UNITED srATss- PATENT; orncs nor. eomncxnn, or nnanm-rnnrrow, GERMANY, AssIenon r0 MIA ausoo 003- f romrron, or nmemron, new YORK, a oonrons'rron or mw .vonx

rnoroemmc' non. rum: sroor.

Application filed November 80, 1928; Serial No.

The present invention relates to photographic roll film spools, more particularly to roll film spools having a cylindrical sheet metal core. The object of thls invention is to 5 form the exit slot of the'core in such a manner as to facilitate threading of the paper stri 'I e photographic roll film spools with a core of sheet metal, which are commonly used, 10 give rise to certain difliculties in the threading of the strips of protecting paper, owing to the end of the strip coming into contact with the inner wall of the core, so that it :im not be directly guided through the exit 16 ot.

- Now I have found that these difiiculties are 7 easily overcome, when the spool core has two oppositely placed longitudinal slots, of which one, the entrance slot, extends throughout approximately the whole lengthof the core and is so narrow that the paper stri is kept straight, as it is introduced throug the slot. The 0 posite exit slot is, on the other hand, so wi e, that, even when the paper strip does ll not. lie exactl on the diameter extendin through the ots, it is sure t'o-pass througg the exit slot. Advantageously this second slot does not extend along the whole length of the core. II In the accompanying drawings, the two figures show respectively two forms ofthe invention, the left hand side of each fi giving a side view, and the right han side being cut away to give a sectional view. "The core 1 cam 'es the end flanges 2 and has a narrow slot 3 which exten along the whole length of the core and a second slot 4 opposite the slot 3. The slot 4 may extend over a long or short portion of the core. In Fig. 1 the slot 4 is comparatively short, in WhlCh case it is advisable to extend narrow slot at each end. 4 is of greater length. i i te m hi 11mm 1h I o p 0 r0 avm a cylindn fz al sheet metal core w ch core as two longitudinal slots placed opposite to each other, one of which is broader than the other.

2. A photo phic roll film 1 having a cylindrical eet metal core, which core has it, as indicated, by a I In Fig. 2 the'slot 322,830, and in Germany December 1c, 1927.

two longitudinal slots placed opposite to each other, one of. which is broader and shorter than the other. v

3. A photo aphic roll film spool having a cylindrical s eet metal core, which core has 55 two longitudinal slots placed opposite to each other, one of -which is oval inform and is broader and shorter than the othe In testimony whereof, I aflix my si ature. V PAUL GOLDAC R. woo 

